Global temperatures were 0.69C (1.24F) above 20th century averages, making 2014 the warmest year in records dating back to 1880, the US National Oceanic and Atmospheric Administration (NOAA) said.
Nine of the 10 warmest years since 1880 have all occurred in the 21st century, with 1998 now ranked as the fourth warmest year on record, the experts said.
The experts have attributed the hot year largely to record high global sea surface temperatures, which were 0.57C (1.03F) above the 20th century average. Land surface temperatures were the fourth highest recorded, at 1C above average.
Six months of 2014 were also record breakers, with a record-warm December finishing off a year which also saw May, June, August, September and October experience new highs.
The new figures confirm expectations announced in early December to coincide with the latest round of UN climate change talks, that 2014 was on track to be one of the hottest, if not the hottest, year on record
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